I have a makerbot, and am using their slicer program. The part I am printing has an extremely coarse thread, 5 threads per inch with a 2 mm thread height. The thread face is at a 30 degree angle (15 degrees of overhang)
I have printed external threads like this without issue and without support material before for various gardening tools (a flow straightener for example). I'm now trying to print an internal threaded part however the rest of the part needs to have support. I've played with the settings in the makerbot software but can't find a combination that will acomplish my goal.
I'm looking for an idea, a setting, or an alternate way of printing the threads without support, but still have supports for the other sections of the part that I know do need them.
Perhaps there is an alternate software that can do something like this, or is best practice to modify the part to have weak structural elements to support the extremely overhanging sections that I'll then break off afterwards and print the part with no supports?
Consider to create an externally threaded part to mate with the internally threaded part, perhaps with a tenth of a millimeter clearance. If possible, configure that part to have minimal structure, making it easier to break away. The externally threaded part will possibly provide support for the portions of the main body while preventing interference with the internally threaded part.
I believe it's not possible to segment a multi-part print for different levels of infill, but if the above fits your requirements, it would be a thin-wall cylinder, thick enough only to support the mating threads. This would allow easier break-away.
An image, sketch, drawing, model, link of your project would make this answer easier or possibly invalidate it completely.